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Gastrointestinal Disorders: Conditions like Crohn's disease, celiac disease, or a history of weight-loss surgery (like gastric bypass) can damage the exact parts of the intestine that are in charge of B12 absorption
After eating, protein is broken down in the stomach, and the hydrochloric acid and gastric protease release B12 into the bloodstream
If you've been doing everything right eating clean, training hard and the fat around your midsection won't budge, the problem may not be your effort
Because the two pathways dont compete for the same receptors, researchers have noted this as a mechanistically distinct pairing worth studying one acting directly on adipocytes, the other acting systemically through growth hormone signaling
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